Improvement in the method of rendering metallic roofs water-tight around the



Thurn STATES PATENT OFFICE.

JOHN TV. BOFSCH, OF CHARLESTON, SOUTH CAROLINA.

IMPROVEMENT IN THE METHOD OF RENDERING VMETALLIC ROOFS WATER-TIGHT AROUND THE CHIMNEYS AND DORME'R-WINDOWS..

Specification forming part of Letters Patent No. 2,850, dated November 12, 1842.

To [tl/f whom, it may concern:

Be it known'that I, JOHN XV. BOESCH, ofthe city of Charleston a-nd State of South Carolina, have invented a new and useful Improvement in Rendering the Joints of Metallic Roofs Vater-Tight without the use of solder, cement, &c., by a new method of shaping and lapping the edges of the sheets of metal of which the roof is constructed, which is described as follows, reference being had to the annexed beforebeing folded; Fig. 7, the two sheets turned up at right angles; Fig. S, the same and showing the rst lap; Fig. 9, the same and showing the second lap; Fig. 10, the same with the turned-up edges doublev lapped and folded and hammered iiat down upon the roof; Fig. 11, one ofthe hooks or fastenings folded. between the sheets and nailed to the sheathing.

To render the joint at the junction of the roof with the chimney, dornier-window, or other projections secure against leaking, take a sheet of copper, or of whatever metal the roof is to be composed, longer than the width of the chimney, and turn up vthe edge next the chimney about eight or ten inches, more or less, so that the surface shall be parallel with the outer surface of the chimney. Then turn up the ends of the sheets at right angles to the roof. Then lap the part of the sheet that folds at the corners against the first described turned-up edge, or against the side of the chimney, as preferred, and securethe same. Then with a pair of shears or other suitable implement scallop the turned-up ends of the sheet,taking out a curved segment ofthe sheet at each turned-up end, leaving sutticient ofthe metal standing at right angles to the roof to form a lap for water-tight joints with the sheets to be added at the sides for closing the side joints, in the manner to be described. The

sheet formed as above described would, if again flattened on a horizontal plane, present a gure such as that represented at Fig. 3.

To close the side joints of the chimney or dormer-window, or other similar side joints, take two sheets to be jointed on the ends of the sheets just described, and take from them segments corresponding in shape with those taken from the ends of the first-mentioned sheet, but of lesser size,being previouslyturned up at right angles tothe roof, which will leave the scalloped edges ofthe lastmentioned sheets higher than the scalloped edges of the last-described sheet. Then lap the edges of the lastdescribed sheet over the edges of the first-described sheet about one-quarter of an inch. Then turn the edges thus lapped again over, forming a double lap, and secure the sheets to the sides of the chimney or dormer. This sheet projects at right angles beyond the first-nien` tioned sheet sufficiently to extend to the sides of the chimney. The last-mentioned sheets, when iiattened out on a plane,would present a iigure resembling that at Fig. 4, and when put together as seen at Fig. l would present a curved and lapped joint at c, Fig. `l, which will be perfectly water-tight, the vertical parts of said side sheets lying hat against the sides of the chimney or dormer in a position to receive another sheet to be jointed thereto to eX- tend beyond the chimney. The upper or turned-up edge of the sheet, coming against the chimney or dormer-window,will come under the usual ledge or projection on the chimney; but if this be omitted in the construction of the building -another sheet may be prepared-such as that represented at Fig. 5- by cutting ont the corners. The ends are then to be turned at right angles, so as to allow the sheet to be tted in between the turned edges of the first-mentioned sheet. The lower edge of this sheet is turned up in a contrary direction, and the upper edge of the rstfmentioned sheet lapped over the turned-up edge, form ing a tight joint. This sheet is then secured against the side of the chimney or dormerwindow under the cornice or eaves or other .projection in a vertical position, which will prev ent water from entering behind the sheets or between them andthe chimney, &c. The side sheets are secured in a similar manner.

The vertical portions of the sheets or turned extend beyond the chimney in a straight line with' the face of 'the same. All the four joints of a chimney, when it passes through the middle of a roof or through one side of it, may be rendered secure against the entrance of water,

even should it be backed up on the roof, behind parapets, by the stoppage of the spouts, or from any other cause above the joints, in the manner before described, or other mode substantially the same.

The peculiar form of the exterior of the chimney or dormer-window or other projection above the roof may render it necessary t0 shape the several sheets of copper required to cover and close the joints so as to correspond therewith; but they all will be double lapped in the manner described. The joints of valleys of roofs are securedin a similar-Inanner by double-lapped joints without solder. The joints formed by the uniting of the edges ofthe sheets required for covering the main body of the roof when thereare no projections are rendered water-tight without solder in the following manner: The four corners of each sheet of metal are cut off at an angle of about forty-five degrees, so as to prevent a too great thickness of metal when folded or lapped, as seen at Fig. 6. The edge of a sheet is then turned up one and a fourth inch, as seen in Fig. 7. The edge of the next sheet above this is turned up in a similar manner one and a half inch, as seen in Fig. 7. This last-mentioned turned-up edge is lapped over the firstmentioned turned up edge one-quarter of an inch, as seen as in Fig. S. The two edges thus united are folded over again a little more than a quarter of an inch, as seen at Fig. 9. The

be rendered proof against the entrance of water Without the use of solder, though-the roof might be fiat and covered with water.

ln order to secure the'sheets to the sheathing, metallic hooks bent at right angles and perforated for nails and screws are put over the turnedup edge of the rst-mentioned sheet before it is lapped, and then nailed to the sheathing, so as to be covered by the succeeding sheet, the hook being folded in between the folds of the sheets entirely out of sight when the roof is completed, which ren ders the covering secure against being stripped by high winds. Fig. 11 represents one ot' the hooks detached from the roof.

What I claim as my invention, and which I desire to secure by Letters Patent, is-

The before-described method of rendering v the joints at the junction of the sheets of'metal secure against lea-king around the chimneys and dormer-windows by bending and scalloping the sheets, in combination `with the double lapping of the joints, as described.

' J. XV. BOESCH. Witnesses:

WM. P. ELLIOT, A. E. JoHNsoN.

The edges of 

